unobtrusively
adv. 不显眼地；不容易看到地；客气地
例句
They slipped away unobtrusively.
他们神不知鬼不觉地溜走了。
《柯林斯英汉双解大词典》
Dora slipped unobtrusively in through the back door.
多拉悄悄地从后门溜了进去。
《牛津词典》
Like a chameleon, he could merge unobtrusively into the background.
他像变色龙一样，可以不引人注意地融入背景之中。
